Telephone system



NOV. 21, 1933. W P|NEL| TELEPHONE SYSTEM Filed April 50, 1932 WKN NWN

S mmm.

N ma tm .m

patentedi ov. 2i,

YWalterf Pinell, erlin-Sieniensstadt, (lerrnany, v

assignonto Siemens & Halske, Aktiengesell-4 schaft, Siemensstadt, near Berlin, Germany v Application-April 30, 1932, Serial-No. 608,401, and inGermany May 5, 1931 tems ofv this type in which certain classes of jcionnectioris are established under control of the call- 1 ing subscriber while other classes of calls are come pleted by a rmanual operator.` The object of the invention is the' provision of new and improved circuits and apparatus for enabling the operatorsv A in such systems to extend and supervise connections with the greatest efciency. y

The invention is particularly adapted for use in systems in which the subscribers lines are equipped with automaticcharging devices and in A which the operation kof the device is determined by the particular oice or zone to which a connection is extended. The apparatus for controlling the operation of the charging devices is preferably set by the calling subscribers before the connections are extended to the operator. The

Z'O setting may be accomplished by a4v calling subscribe-' er dialling a digit or digits 'indicating the* routey or value of the connection as determined Ybythe office or zone for which the call is intended. r)This arrangement relieves the operatorof the necessity l of setting thecontrolling apparatus: or of controlling the charge devices manually. Inpriorsystems, however, it has been necessary for the oper'- ator to check the setting ofthe' controlapparatus in ordery to insure the assessment of the proper charge for a call. n -Y n The `present invention further simplifies the operators duties by providing an automatic checkv on the setting of the control apparatus.` Anvautomatically controlled signal at the Voperators posi-` tion is arranged to indicate any discrepancybetween the value of a rconnection as requeste'dfbyl the, calling party and the Value of the connection as finally established bythe operator. `If given the facilities provided by the present invention, the operator need not trouble to check whether the value of the connection required by the calling subscriber equals the value of a connection in the indicated zone.

subscriber then requires a connection ofhigh Value. 'I'he operatorie consequently in a'position to refuse the further setting upof the' connection. v

Operators are also given the facility of being.'

If she does not-receive the signalv immediately after having performed the required' f switching operations (i. e., seized an outgoing- 13 cleanse; (ol- "17e-T27).

able todeterrnine at a glance whether a connection has been set up, thev value of which does not correspond to the value of the connection in ther indicated traffic zone. I

The signal lamp'associated with theincoming line may also be suitably controlled by the switching devices.` j' 'Y c One embodiment of vthe invention is'shownin the accompanying drawing. Only the switching` apparatus and 'circuit details necessary'for explaining the subject matter of the invention have been shown.V This includes an incoming trunk' terminating in rajacl; AK, an operators cord circuit, a number of trunks outgoing to different ofiicesffrorn the operators position Fig. 1, and call-checking equipment AS. The'rnultiple connections ofthe outgoing trunk at a second operators position'lig. 2 have also been shown.

The' devices at the operators position Fig. l are seized Vover the c-lead over which the following circuit is Vclosed;` earth' applied by the preceding connecting device, 'c-lead winding of relay C, contacts"304c,"3o6g, battery, earth. A number of groups of'incoming'lines lead to the-Voperatorisv positionjand each line is associatedwith an indicator comprising a; stepping switch which'opefrfates afterthe manner of a call nder and is represented for convenienceas va call finder AS, a switfch W, and a signal lamp. Relay C is energized in the above-mentioned circuit and Vsets up' its own locking circuitv byclosing its contact 305e (light contact).` The following circuit for relay G is completed at'contact 313e: earth, contacts *312th 31'3'c, winding of relay G, battery, earth. 1 Relay G'is energizedv in this circuit and opens itscontact 3069!.V This disconnects bat-'9A tery, withthe result that other incoming lines of this group cannot seize the device at the oper- ,relay An, contact 32319, battery, earth.' Relay Anl closes its contact 320km and consequently also the stepping circuit for the call finder AS: earth,

interrupter U72, Contact 31933, magnet Das, contactv320a`n, battery, earth. Tha magnet Das, underV the influence of the interrupter U2, advances Vits switch wipers a, b, c, d, step by step. Whenthe switch wiper a has reached the contact" inthe call finder AS to which earth is applied at 1 contact 3G80, the following circuit will'be setup: earth, contacts 307W, 308e, a-'wiper ofthe callV finder AS, windingsl I and II of relay P,.- contact 311f, battery, earth.- Relay P is ener-l gized in this circuit, The high resistance winding II of relay P is short circuited by the closing of contact 31011 so as to set up the guarding against further seizures. A locking circuit for relay P is set up independent of contact 307t1 due to the closing of contact 3091i. The opening of contact 319p cuts oif the stepping circuit for the call iinder AS with the result that said switch is brought to rest. Due to the opening of contact 32311 the circuit for relay An is opened at the same time and this relay, by opening the conf tact 320cm, opens a second point in the circuit for the driving magnet. a j

The calling subscriber, after having received a signal (not shown in the drawing) which may be transmitted to him over a front contact of relay C, now sends out an impulse series denoting the traic zone. Relay A is inuenced by said impulse series over the a-lead. The impulses actuating relay A are transmitted at contact 3l7a to the rotary magnet Dw of the switch W. Said rotary magnet is energized in the following circuit: earth, contacts 31711, 318C, b-wiper of the call nder AS, Winding of the rotary magnet Dw, winding of relay V, battery, earth. The wipers aw and bw of the switch W are set to a definite contact according to the number of impulse series. It will be assumed that the 1mpulse series consists of a single impulse and that therefore the wipers of the switch W are 'set to the rst contact. The slow-acting relay V is disposed in the stepping circuit and is adapted to disconnect the signal lamps during the setting operation by opening its contact 3601). The following circuit is set up when contacty 360o has been closed after a definite period following the last impulse of the transmitted impulse series: earth, contacts 324i, 360o, wiper aw of the switch W, lamp L1, battery, earth. The lamp Ll there-r fore lights up and characterizes a definite trafic zone, for example, zone 1 in which zone the calling subscriber required a connection. On the release of. relay V and after contact326v has been closed, the following circuit is completed for the signal lamp AL: earth, signallamp AL, c-wipei` of the call nder AS, contacts 32612, 327km) (off normal contact, which is mechanically closed on the first step executed by the switch W) conf tact 328i, battery, earth. An additional contact 3141cw, which is mechanically actuated by the stepping switch on its advance maintainsv lthe circuit for relay G independent of contact 312W. The lighting of the signal lamp AL indicates to the operator that a subscriber is calling, Whereupon she inserts the answering plug ASt into the jack AK. The following circuit is now set up over the plug sleeve: earth, supervisory lamp SL, plug sleeve of the plug AK, winding of relay Tr, con-V tact 303C, resistance Wil, battery, earth. Relay Tr is energized in this circuit, whereas the super-A visory lamp SL cannot light due to the resistance Wil placed in this circuit. Relay Tr, at contact 321tr, opens an additional point in the circuit for relay An, and also a point in the circuit for relay G at contact 312151 The impulse relay Avis disconnected at contact 301t1', while the circuit closed for the purpose of energizing relay P is opened at contact 307151'. Relay P, however, as already mentioned, cannot yet relapse due to the fact that contact 30910 has closed a locking circuit for it. The operator, afterhaving received the calling subscribers instructions, inserts the calling plug VSt in a jack to which a junction line leading to the required exchange is connected. Previous to this, however, she tested in known manner, for example, by theknown click test,

whether the junction line in question is idle or busy. Assuming that the outgoing junction line connected to the jack Kal and leading to the exchange required by the calling subscriber is idle, the operator, on inserting the plug VS1? in the jack Kal, completes a circuit for relay HR which was preparatorily connected up on the insertion of the enquiry plug ASt: earth, resistance Wi2, plug sleeve of the jack Kal, line in the cord circuit, corresponding contact spring, winding of relay HR, battery, earth. Relay HR is energized inthis circuit, closes its contact 329mand thereby sets up the following circuit for relay F: earth, contact 329hr,dwipe`r of the call nder AS, winding of relay F, bw-wiper of the switch W, contact l, contacts 332111, 333e1, battery, earth. Contact 332lr1 was closed when the plug was inserted in the jack KAl due to the fact that the following circuit was completed for relay LRl: earth, Contact spring 346, winding'of relay LRl, battery, earth. Relay LRl, in addition to closing contact 3321151, also closes its contact 338111 and consequentlythe following circuitfor relayEl: earth, contact 338Zr`l, winding of relay El, battery, earth. Relay El is so constructed that it actuates its contact only after a denite period. Relay F is energized in the above circuit as longfas the' guished, the operator knows that the trailiczor'ie dialled by the calling subscriber co-inc'ides with the zone denoted by the switch W. The signal lampALv is extinguished at the same time due to the opening of contact 3281. VThe opening of Contact 3113 cuts off the locking circuit for. relay P with'the result that this relay releases. `The opening of contact 3(l9p` prevents relay P from being connected up afresh on the relase of relay F. The )closingof contact 3151) sets up the steppin'gcircuit for the rotary magnet DW of the switch W as follows:v earth, interrupter Ul, contacts 31511, 316Icals (closed as soon as the call nder leaves its normal position) winding ofthe stepping magnetW, winding of relay V, battery, earth. lThe interruptor U1 causes thewipers'aw and bw of the switch `W to advance step by step untilthey reach their original positions in which contact 3161cds `and consequently the abovermentioned stepping circuit is opened. Due to relay V being re-energized, which caused the opening of contact 360o, the lamps cannotbe lighted while the switch W is being restored to normal.. The circuitfor relay F is only maintained for a short period but.

of sufcient duration to restore the switch W to normal by openingcontact 311f. The circuit for relay Fis out off vat contact 33361 when relay El is energized after a short period.A As soon as the switch W has reached its original position, contact 314kw will be re-opened, causing relay G to release. This results in the closing of contact 306g,

whereupon the indicator may be seized .by other incoming lines of the group.

Four voutgoing junctionlines are shown in thev drawing, each two of which are of the same value. Thus the junction line connected to the jack Ka2 leads to the same traffic zone as the line connected to the jack Kal. If, for example, the junction line connected to the jack-Kal is seized from an- 159 switch W is set as before, closes a circuit for relayv F which extends over contact 33162. Apart from this, all the :remaining switching operations are nections and which actuate the indicators (not identical with those previously described.

Shouldthe switch W be set to a different contact, 'for example, contactv 2 due to thetransmisY sion of a diiferent identification digit, relay F 'can only .be energized over the contacts associated with relays LRll and LR12; that is to say,`when alconnection is to be set u 'p over the outgoing lines connected to the jacks KiBl and KB2. The devices associated with these jacks are exactly identical with'those associated with the jacks Kaland Ka2. Either relay LRll'or LR12 is en:

ergized according to whether theplug is insertedV is'accordingly closed over either contact 3341111 or 3361rl2 and also over either contact 335e11-or 337e12. u n f If the calling subscriber now requests the operator to complete a' connection the value of which differs from that `denoted by the switch W according to the identification digit, ak circuit for relay F cannot beset up on the insertion'of the plug in 'the jack to which the required junction line is connecteddueto the fact that the oorresponding contacts of relay LR are not connect# ed over the bank contact'to Which'the switch'W has been set. Relay F, therefore, cannot be actu'- ated with the consequence that the zone indicating lamp'is notv extinguished. vThis gives the o'perator to understand that the calling subscriber either has made a mistake or else is endeavoring v ended and consequently withdraws the calling and answering plugs from their respective jacks which causes all the associated devices, including relays LR and E, to be restored to normal.

As previously mentioned, a plurality of groups of incoming lines may terminate at an operators position, each line being associated with an indicator. Relays LR and E in a connection of the type described above then actuate the indicators of all the other groups, that is to say, either contacts 330112, 332111, or contacts 3341111 are actuated. The circuit for relay F in the other indicators,`however, cannot be closed owing to the energization of this relay being dependent on relay HR, individually associated with each incoming line.

The drawing also shows a second operators position AF2 provided with corresponding indicators not shown in the drawing. Connections may be setup over the same outgoing lines `also from this operators position. The indicators at the operators position APl, however, be innuenced when the operator at the position AP2 seizes the lines or vice versa Vdue to the fact that the switching means which influence the indicators (relays LR land E) are arranged in thejack KBl or KBZfThe circuit for relay F cannot individually for each operators position and are i only operable on the setting upof connections vfrom the appropriate operators position. Thus the common outgoing junction lines for the operators position Fig. 2 are connected to the jacks KAl, KAZ., KB1- and KBZ. 'The relays which'` are linfluenced on the settingup of conshown) at the operators position Fig. 2, in this case are' represented-by the reference characters LRl, LR2, LRll, `andLRlZ. Apart from this the switching operations carried out for the setting up of connections from the operators position Fig.` 2 are exactly identical With those al-A readyvfdescribed.-` f

Whatis claimed is:

l. In a telephone systemY in which of a connection is indicated by a calling party prior to thefextensionof the connection, means including a cord circuit for extending the connection, and a signal operated responsive to the extensionof a connection of a different value than that'indicated by the calling party.

2. In a telephone system in which a calling party rst indicates the value of a wanted connection 'and is thenconnected to an operators position, means at the position for completing connections of diiferentsvalues, and means at the position for notifying the operator'when the value of a completed connection' differs from the value indicated by thefcalling party.

3. Ina telephoneA systeml in Which a calling party first indicates the zone to which a connection isY desired and is then connected to an operators position, means at the position for extending the connection to any one of a plurality of zones, and a signal at the position for notifying the operator Whether the connection has been extended to the zone indicated by the calling party or to a diii'erent zone.

4. In a multi-office telephone system in which a calling party in one oiiice to obtain connection with a called party in a different office first registers the designation of the wanted cnice to obtain a connection with an operators position, means at the position for extending the connection to any one of a plurality of offices, and means at the position operated responsive to theA extension of the connection for indicating that the connection has been extended to the oflice designated by the calling party.

5. In a telephonesystem in which aV calling party initially indicates the value of a desired connection and is then connected to an operators -position, a signal at the` position operated reand means operated when the value of the extendedl connection corresponds with the indicated value of the wanted connection for disabling said signal. e

6. In a telephone system in which a calling party initially indicates lthe trunk to which a connection is desired and is then connected to an operators position, a signal at the position operated kresponsive to `the call and independent of said trunk indication, means at the position for connecting the calling party to any one of a plurality of trunks, and means associated with the trunks for disabling said signal when the trunk connected with corresponds to the trunk indicated by the calling party.

'1. A telephone system as claimed in claim 6 in which the means associated with the trunks consists of a pair of relays for each trunk and circuit the value CTI abling the signal. I

8. In a telephone system, an operators posi--A tion, an incoming trunk terminating at the position, a plurality of groups of outgoing trunks terminating at the position, cord circuits for connecting said incoming trunk to any one of said outgoing trunks, checking apparatus comprising two switches, means for extending a connection to said position viasaid incoming trunk, means responsive to theextension of the connection for causing the first of said switches to associate itself with the trunk, means responsive to impulses received over the incoming trunk for setting the other of said switches to indicate a particular group of outgoing trunks, and means responsive to the connection of the incoming trunk to an outgoing trunk in the group indicated for releasing said other switch.

9. A telephone system as claimed in claim 8 in which the two switches jointly control a signal for notifying the operator that the outgoing trunk connected with is in the group indicated by the digit impulses received over the incoming trunk.

10. In a telephone system, a trunk line extending to an operators position, means including an automatic switch responsive to a digit called by a lsubscriber for connecting his line to said trunk line, a register switch associated withA the position for recording a fui-ther digit which is' characteristic of the desired connection, means whereby the operator can answer the call and complete aV connection requested by the subscriber, and means for notifying the operator in case the connection completed does not corre.- spond to the one denoted by the setting of said register.

connections controlled by thevrelays for dis' 11. vIn atelephone system, any operators lswitchy board, means for extending ia calling-line thereto,4

means `for. requiring Vthe"calling subscriber to` dial a. digit indicative 'of the connection 'desired-ber. fore the operator is signalled,` means for com-` pleting any connection requestedv by the subscriber, vand means for notifyingthe operatorif there is a discrepancy betweenthe connection indicated by the dialled digit and the one actually requested bythe subscriber and completed by the' 85 operator. .A Y v 12. In a telephone system, a trunk line incom-, ing to an operators position, means `for extending a calling line to said trunk line, a plurality of trunksjoutgoing from said position, a verification switch which is set bythe calling subscriber over the said incoming 4trunk in accordance with a de l sired outgoing trunk, means whereby tlgleLopera torl can connect the incomingtrunk withany outgoing trunk requested by the subscriber, means foradvising the operatorof the` f actwhen she, connects up an outgoing trunk which does not correspond with the setting of said switch.

13. In a telephone system, a trunk lline incoming to an operators position, means` for extend- 10() in g a calling line to, said trunk line, 'a,pluralityofk trunks outgoing fromgsaid 1 )osition, .a verificationY switchrwhich isset bythe calling subscriber over the said incoming trunkV in accordance with a desired outgoing trunk, means wherebythe Opeljator 10,5 can,Y connect the incoming trunk with any out-"- going trunk requested by thesubscriber, atrlinkA signal actuated4 bygsadid switch, and means re sponsive to the connecting upy of an outgoing trunk which corresponds to thesignal for releas- HQ ing the switchand restoring the signal.

. WALTER PINELL. 

